507
Q:

A student multiplied a number by 3/5 instead of 5/3, What is the percentage error in the calculation ?

A) 54 % B) 64 %
C) 74 % D) 84 %

Answer:   B) 64 %



Explanation:

Let the number be x.

Then, ideally he should have multiplied by  x by 5/3. Hence Correct result was x * (5/3)= 5x/3. 

 

By mistake he multiplied x by 3/5 . Hence the result with error  = 3x/5 

Then, error = (5x/3 - 3x/5) = 16x/15 

Error %  = (error/True vaue) * 100 = [(16/15) * x/(5/3) * x] * 100 = 64 %

Q:

If U = 450 and V = 585, then V is how much percentage more than U?

A) 130 B) 23.07
C) 25 D) 30
 
Answer & Explanation Answer: D) 30

Explanation:
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3 101
Q:

What will be the net discount (in percentage) for two successive discounts of 30% and 20%?

A) 50 B) 56
C) 44 D) 54
 
Answer & Explanation Answer: C) 44

Explanation:
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2 102
Q:

If 170% of a number added to 66, then the result becomes equal to twice of the number. What is the number?

A) 200 B) 220
C) 210 D) 236
 
Answer & Explanation Answer: B) 220

Explanation:
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1 95
Q:

60% of P = 50% of Q and Q = x% of P. What is the value of x?

A) 130 B) 120
C) 140 D) 80
 
Answer & Explanation Answer: B) 120

Explanation:
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2 124
Q:

The marked price of a shirt is twice of the cost price. To earn a gain of 25%, what should be the discount percentage?

A) 37.5 B) 50
C) 75 D) 52.5
 
Answer & Explanation Answer: A) 37.5

Explanation:
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4 235
Q:

If 30% of 40% of X is 240, then what is the value of X?

A) 441 B) 2000
C) 1200 D) 1800
 
Answer & Explanation Answer: B) 2000

Explanation:
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2 135
Q:

A man sells an article at a profit of 35%. If he had bought it for 15% less price and sold it for Rs. 32 less, then he would have gained 40%. What is the initial cost price (in Rs) of the article?

A) 250 B) 200
C) 300 D) 400
 
Answer & Explanation Answer: B) 200

Explanation:
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0 238
Q:

If the side of square is increased by 6%, then what will be the percentage increase in its area?

A) 3.2 B) 12.04
C) 12.12 D) 12.36
 
Answer & Explanation Answer: D) 12.36

Explanation:
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0 160